414 chev street engine

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KnightEngines
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414 chev street engine

Post by KnightEngines »

Dyno'd this one yesterday, the brief was a strong, reliable street engine that idled clean etc - something that can do quite a lot of time between freshens, boil tyres at will & go under the hood of a HQ holden.

Posting this up coz it turned out pretty nice for basically a 'buy the bits, machine the block & bolt it together' build.

Combo was as follows:
SHP block
Scat 3.875" crank
Callies 6" rods
CP bullet pistons
Romac balancer

AFR220 comp port heads
Jesel sportsman 1.6/1.6 rockers
Crane hyd roller lifters
Crane 256/262 on 108 centres hyd roller cam, .400/.400" lobes
Super victor intake
Quickfuel 950 carb
MSD ignition

Moroso pan
Mellings shark tooth pump

That's the basics of it, I machined the block & set deck height at -.015" to use .027" MLS head gaskets, block needed minor clearancing for rods, rods cleared the cam no problem.
I pulled the heads down, decided the guide clearance etc was fine, blended the valve job into the chambers & bowls, bumped the seats with stone & put them back together with hyd roller springs.
Intake got a match port & minor runner entry work

Compression was 11.5:1 to run on out pump 98 (roughly the same as US 93).

It's a combo a DIY'er could build at home fairly easily with only block machining & balancing needing to be outsourced.

Headers were pacemaker 1 3/4" primary 4-1 with 3" collectors.

We didn't test with any carb spacers or get real fussy with the tune - spacers would push it through the hood, which ain't gonna happen so it was kinda pointless & it made 40hp more than the owner required anyway. I believe a 2" tapered 4 hole would be worth a solid 10hp on this engine & some TQ as well, 1 7/8" headers would also likely show a gain in the top end, but as it sits it fits in the car no problem.

Image20180920_095610 by tony knight, on Flickr

ImageAaron 414 by tony knight, on Flickr
KnightEngines
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Re: 414 chev street engine

Post by KnightEngines »

Car weighs about 3600lb, converter will be 4500rpm & it has 3.5 gears in the diff.
randy331
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Re: 414 chev street engine

Post by randy331 »

That should be a fun engine in that car.

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Re: 414 chev street engine

Post by treyrags »

Nice flat curve. Great street engine.
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Re: 414 chev street engine

Post by tenxal »

Nice package. :)
F-BIRD'88
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Re: 414 chev street engine

Post by F-BIRD'88 »

From the dyno sheet. Disp:289. Is this the cid of the motor. If so this entry will give a false dyno software calced) friction horsepower thus a optimistic CHP output.
Should read Disp:414. No?

Otherwise. Nice job.
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Re: 414 chev street engine

Post by MadBill »

I think a lower than actual friction HP assumption will (depending on how far over 1.0000 the CF is) slightly reduce the calculated corrected HP. E.g., if actual power is 500 @ 6000 RPM and the dyno's stored value for friction power at that speed for a 289" is 170.0 HP, then corrected power will be (500 + 170.0) x 1.0415 = 697.8-170.0 = 527.8. If the actual friction value of the 414" was 230.0 HP, the calculated corrected power would be (500 + 230) x 1.0415 = 760.3 -230 = 530.3
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Re: 414 chev street engine

Post by F-BIRD'88 »

Whats 50 hp amoung $ friends $ ?
Still a nice build.
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Re: 414 chev street engine

Post by steve cowan »

Nice work Tony as per usual,
Should run 120 mph plus if required even with the highway rear gear
A couple of questions if you don't mind,
Even on these so called competition heads do you look at the short turn at all, I understand blending and sizing the throat area but do you take that back to and over the SSR?
With the intake clean up and port match did you have to open the pinch as well, was the pinch sized for the application in this instance eg cubic inches, rpm specific
Thanks for any information
steve c
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Re: 414 chev street engine

Post by KnightEngines »

Bore stroke etc were correctly entered, but the text was unchanged from the last Paxton blown 289 dynod by oversight.
Inertial corrections are correct, I'll scan & post that stuff tomorrow.

Steve - nothing more than a blend in of the steps where valve job met bowls & chambers, about an hours work, nothing done with turns or pinch. Hp target was 530-550hp, I figured there was no need to get fancy especially considering my current workload & time constraints.
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Re: 414 chev street engine

Post by RevTheory »

How well did the "idled clean" work out?
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Re: 414 chev street engine

Post by 427dart »

Nice build! How well does a 4500 convertor work with a 3.50 gear at typical street cruising speeds?
Will it be slipping at 2500 RPM? Years ago I had a 3800 stall convertor in my '85 Mustang with C-4 and a 3.89 gear and it wasn't much fun at 45 MPH!
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Re: 414 chev street engine

Post by Keith Morganstein »

F-BIRD'88 wrote: Sat Oct 13, 2018 12:29 pm From the dyno sheet. Disp:289. Is this the cid of the motor. If so this entry will give a false dyno software calced) friction horsepower thus a optimistic CHP output.
Should read Disp:414. No?

Otherwise. Nice job.
AFAIK, DEPAC software does inertia correction (Not engine frictional correction)

Superflow software has friction correction. I have always thought any correction for internal engine friction was bogus. All that matters is output at the crankshaft. However, one Superflow tech/ trainer said it was a way of correcting for the Dyno friction loss. I never saw the math tho...
Automotive Machining, cylinder head rebuilding, engine building. Can't seem to quit #-o
F-BIRD'88
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Re: 414 chev street engine

Post by F-BIRD'88 »

It does not matter what you call it. It is still a input that effects the accounting for the mechanical spinning power (consumption) of the engine (which the weather does not affect.
Thus skewing the "corrected" power output.

If that input disp: is engine cid. (EG: 414 CID) It needs to be entered accuratly.
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Re: 414 chev street engine

Post by Keith Morganstein »

F-BIRD'88 wrote: Sun Oct 14, 2018 12:11 pm It does not matter what you call it. It is still a input that effects the accounting for the mechanical spinning power (consumption) of the engine (which the weather does not affect.
Thus skewing the "corrected" power output.

If that input disp: is engine cid. (EG: 414 CID) It needs to be entered accuratly.
Nope, DEPAC is not inertia correcting the engine. It’s correcting for the inertia of the dyno at different sweep rates.
Automotive Machining, cylinder head rebuilding, engine building. Can't seem to quit #-o
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